\tracingonline=2
\tracingcommands=2
\tracingmacros=2
\tracingrestores=2

\catcode`{=1
\catcode`}=2

\font\x=cmr10
\font\y=cmr10 at 22pt
\font\z=cmr12

\x

{

%hyphenchar
\showthe\hyphenchar\x
\showthe\hyphenchar\y
\showthe\hyphenchar\z
\showthe\hyphenchar\font

\hyphenchar\x=20

\showthe\hyphenchar\x
\showthe\hyphenchar\y
\showthe\hyphenchar\z
\showthe\hyphenchar\font

\hyphenchar\z=30

\showthe\hyphenchar\x
\showthe\hyphenchar\y
\showthe\hyphenchar\z
\showthe\hyphenchar\font

\z

\showthe\hyphenchar\x
\showthe\hyphenchar\y
\showthe\hyphenchar\z
\showthe\hyphenchar\font

\hyphenchar\z=300

\showthe\hyphenchar\x
\showthe\hyphenchar\y
\showthe\hyphenchar\z
\showthe\hyphenchar\font

\x

%skewchar
\showthe\skewchar\x
\showthe\skewchar\y
\showthe\skewchar\z
\showthe\skewchar\font

\skewchar\x=20

\showthe\skewchar\x
\showthe\skewchar\y
\showthe\skewchar\z
\showthe\skewchar\font

\skewchar\z=30

\showthe\skewchar\x
\showthe\skewchar\y
\showthe\skewchar\z
\showthe\skewchar\font

\skewchar\z=300

\showthe\skewchar\x
\showthe\skewchar\y
\showthe\skewchar\z
\showthe\skewchar\font

\z

\showthe\skewchar\x
\showthe\skewchar\y
\showthe\skewchar\z
\showthe\skewchar\font

%fontdimen

\fontdimen-1\x=39pt
\fontdimen0\x=40pt
\fontdimen1\x=41pt
\fontdimen2\x=42pt
\fontdimen3\x=43pt
\fontdimen4\x=44pt
\fontdimen5\x=45pt
\fontdimen6\x=46pt
\fontdimen7\x=47pt
%\fontdimen8\x=48pt %TODO
%\fontdimen9\x=49pt

\showthe\fontdimen-1\x
\showthe\fontdimen0\x
\showthe\fontdimen1\x
\showthe\fontdimen2\x
\showthe\fontdimen3\x
\showthe\fontdimen4\x
\showthe\fontdimen5\x
\showthe\fontdimen6\x
\showthe\fontdimen7\x
%\showthe\fontdimen8\x
%\showthe\fontdimen9\x

}

\showthe\skewchar\x
\showthe\skewchar\y
\showthe\skewchar\z
\showthe\skewchar\font

\showthe\skewchar\x
\showthe\skewchar\y
\showthe\skewchar\z
\showthe\skewchar\font

\showthe\fontdimen-1\x
\showthe\fontdimen0\x
\showthe\fontdimen1\x
\showthe\fontdimen2\x
\showthe\fontdimen3\x
\showthe\fontdimen4\x
\showthe\fontdimen5\x
\showthe\fontdimen6\x
\showthe\fontdimen7\x
%\showthe\fontdimen8\x
%\showthe\fontdimen9\x

\end
